Pathophysiology of Small Testes in Beef Bulls: Histopathological Features of Testes and Epididymides, Seminal Characteristics, and Endocrine Profiles (Testicular Hypoplasia, Degeneration, Breeding Soundness, Scrotal Circumference)
Veeramachaneni, Durga Nageswara Rao
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https://hdl.handle.net/2142/71329
Description
Title
Pathophysiology of Small Testes in Beef Bulls: Histopathological Features of Testes and Epididymides, Seminal Characteristics, and Endocrine Profiles (Testicular Hypoplasia, Degeneration, Breeding Soundness, Scrotal Circumference)
Author(s)
Veeramachaneni, Durga Nageswara Rao
Issue Date
1985
Department of Study
Veterinary Medical Science
Discipline
Veterinary Medical Science
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Biology, Veterinary Science
Abstract
Seventeen beef bulls (2 to 3 1/2 years of age) with a scrotal circumference (SC) ranging from 27 to 40.5 cm were used to study the pathophysiology of small testes. All four bulls having a SC of 30 cm) and azoospermic or oligospermic (and having a SC < 30 cm) bulls. However, in the latter group, the mean concentration of testosterone and the response to LH pulses, whether spontaneous or induced, were significantly lower. The fact that these bulls were not deficient in gonadotropins suggested that the impairment in Leydig cell structure and function was caused by local factors, either the factors that caused the tubular damage or those consequent to the tubular damage. Hence, Leydig cell failure in these bulls may not be the primary cause of germinal epithelial loss but an effect.
These findings indicate that "small testes" in postpubertal beef bulls will very likely have severe lesions and that the primary cause of "small testes" is not a deficiency of peripheral gonadotropins or testosterone.
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